Derivative Financial Instruments - Carrying Amount and Adjustment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
AFS, amortized cost basis	$ 546,640
Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
AFS, amortized cost basis	88,200	$ 88,200
Loans | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of the hedged assets	474,957	474,233
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets	21,440	4,961
Securities available-for-sale | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying amount of the hedged assets	151,538	159,188
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets	$ 2,802	$ (229)